What is PA BGM system?

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Tags

1. #electronic
2. #system
3. #related
4. #loudspeakers
5. #means
6. #equipment
7. #generally
8. #reinforcement
9. #amplifiers
10. #music
11. #specifically
12. #sound
13. #public
14. #comprising
15. #performance
16. #microphones
17. #address